linux-kernel - Re: [RFC PATCH] mfd: dt: Add Aspeed LPC binding

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Date:   Fri, 18 Nov 2016 10:11:41 +1030
From:   Andrew Jeffery <andrew@...id.au>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Lee Jones <lee.jones@...aro.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Joel Stanley <joel@....id.au>,
        Rob Herring <robh+dt@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [RFC PATCH] mfd: dt: Add Aspeed LPC binding

On Thu, 2016-11-17 at 10:30 +0100, Linus Walleij wrote:
> > On Thu, Nov 17, 2016 at 7:06 AM, Andrew Jeffery <andrew@...id.au> wrote:
> 
> > +* Device tree bindings for the Aspeed LPC Controller
> 
> We are going overboard with the lingo sometimes, to the point that we do not
> understand how terse things become.

Sorry for that, it is a bit terse. Sometimes I struggle to gauge how
much context I should provide.

Joel's reply covers the details of your queries below, but I'll make
sure to add the information to the bindings as well.

> 
> LPC = Low Pin Count, right?
> Explain that right here: it is a slow external bus, right?

> > +The Aspeed LPC controller contains registers for a variety of functions. Not
> > +all registers for a function are contiguous, and some registers are referenced
> > +by functions outside the LPC controller.
> > +
> > +Note that this is separate from the H8S/2168 compatible register set occupying
> > +the start of the LPC controller address space.
> > +
> > +Some significant functions in the LPC controller:
> > +
> > +* LPC Host Controller
> > +* Host Interface Controller
> 
> Host interface to what?
> 
> > +* iBT Controller
> 
> What is iBT?
> 
> > +* SuperIO Scratch registers
> 
> Again more context please.
> 
> With standards documents, either explain everything or provide
> pointers for the information.

ACK!

Andrew
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